MPL115A2_10 [FREESCALE]

Miniature I2C Digital Barometer; 微型I2C数字气压计


型号：	MPL115A2_10
厂家：	Freescale
描述：	Miniature I2C Digital Barometer 微型I2C数字气压计
文件：	总8页 (文件大小：210K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Pressure

MPL115A2

Rev 6, 03/2010

Freescale Semiconductor

Miniature I²C Digital Barometer

The MPL115A2 is an absolute pressure sensor with digital output for low cost

applications. A miniature 5 x 3 x 1.2 mm LGA package ideally suits it for portable

electronics and space constrained applications. Low current consumptions of

5 μA during Active mode and 1 μA during Shutdown (Sleep) mode target battery

and other low-power applications. A wide operating temperature range from -40°C

to +105°C fits demanding environmental requirements.

MPL115A2

50 to 115 kPa

Application Examples

• Barometry (portable and desk-top)

• Altimeters

MPL115A2 employs a MEMS pressure sensor with a conditioning IC to provide

accurate pressure measurement from 50 to 115 kPa. An integrated ADC provides

digitized temperature and pressure sensor outputs via an I²C port. Calibration

Data is stored in internal ROM. Utilizing raw sensor output, the host

microcontroller executes a compensation algorithm to render Compensated

Absolute Pressure with 1 kPa accuracy.

• Weather Stations

• Hard Disk-Drives (HDD)

• Industrial Equipment

• Health Monitoring

The MPL115A2 pressure sensor’s small form factor, low power capability,

precision, and digital output optimize it for barometric measurement applications.

• Air Control Systems

Features

• Digitized pressure and temperature information together with programmed

calibration coefficients for host micro use.

• Factory Calibrated

• 50 kPa to 115 kPa Absolute Pressure

• 1 kPa Accuracy

• 2.375 V to 5.5 V Supply

• Integrated ADC

• I²C Interface

• Monotonic Pressure and Temperature Data Outputs

• Surface Mount RoHS Compliant Package

ORDERING INFORMATION

# of Ports

Pressure Type

Digital

Interface

Device Name

Package Options Case No.

Tape & Reel 2015

None

Single

Dual

Gauge

Differential Absolute

I²C

MPL115A2T1

•

LGA PACKAGE

Pin Description

NAME

FUNCTION

VDD

VDD Power Supply Connection.

External Capacitor

Ground

CAP

GND

SHDN

RST

MPL115A2

5.0 mm X 3.0 mm X 1.2 mm MAX

Shutdown (Sleep): Connect to GND to disable the device.

Reset: Drive line low to disable I²C communications.

NC: No connection.

SCL

SDA

SDA⁽¹⁾

SCL⁽¹⁾

SDA: Serial data I/O line.

CAP

I²C Serial Clock Input.

GND

1. Use 4.7k pull-up resistors for I²C communication.

RST

SHDN

PIN CONNECTIONS

Pressure

Maximum Ratings

Voltage (with respect to GND unless otherwise noted)

V_DD.............................................................................................................................. -0.3 V to +5.5 V

SCLK, CS, D_IN, D_OUT................................................................................................. -0.3 V to V_DD+0.3 V

Operating Temperature Range .................................................................................... -40°C to +105°C

Storage Temperature Range........................................................................................ -40°C to +125°C

Overpressure............................................................................................................... 1000 kPa

Operating Characteristics

(V_DD= 2.375 V to 5.5 V, T_A= -40°C to +105°C, unless otherwise noted. Typical values are at V+ = 3.3 V, T_A= +25°C.

Ref

Parameters

Operating Supply Voltage

Supply Current

Symbol

V_DD

Conditions

Min

2.375

—

Typ

3.3

—

Max

5.5

Units

I_DD

Shutdown (SHDN = GND)

μA

Standby

—

3.5

μA

Average – at one measurement per second

—

μA

Pressure Sensor

Range

—

0.15

±1

115

—

kPa

Resolution

Accuracy

-20ºC to 85ºC

—

kPa

Power Supply Rejection

Typical operating circuit at DC

0.1

—

kPa/V

kPa

100 mV p-p 217 Hz square wave plus 100 mV

pseudo random noise with 10 MHz bandwidth.

—

Conversion Time

(Start Pressure Convert)

tcp

Time between start convert command and data

available in the Pressure register

—

0.6

0.7

Temperature Sensor

Range

-40

—

105

0.7

ºC

Conversion Time

(Start Temperature Convert)

tct

Time between start convert command and data

available in the Temperature register

0.6

10 Conversion Time

tcb

Time between start convert command and data

available in the Pressure and Temperature

registers

—

0.8

(Start Both Convert)

11 Resolution

Temperature ADC is 472 counts at 25ºC

-5.35

—

counts/ºC

I²C I/O Stages: SCL, SDA

12 SCL Clock Frequency

13 Low Level Input Voltage

14 High Level Input Voltage

f_SCL

VIL

—

400

KHz

0.3V

VIH

0.7V

—

I²C Outputs: SDA

15 Data Setup Time

t_SU

Setup time from command receipt to ready to

transmit

100

—

I²C Addressing

MPL115A2 uses 7-bit addressing, does not acknowledge the general call address 0000000. Slave address has been set to 0x60 or 1100000.

MPL115A2

Sensors

Freescale Semiconductor

Pressure

1 μF

VDD

ADDR

1 μF

CAP

Coefficient

Storage

ADDR

Diff

Amp

SHDN

ADDR

Pressure

ADC

ADDR Temperature

Temp

Sensor

4.7 k

SCL

μC

4.7 k

Microcontroller

I²C

Interface

SDA

RST

GND

Figure 1. Block Diagram

Compensation

The pressure compensation for MPL115A2 is based on a 2-dimensional, second order polynomial.

The 10-bit compensated pressure output, Pcomp, is calculated as follows:

Pcomp = a0 + (b1 + c11*Padc + c12*Tadc) * Padc + (b2 + c22*Tadc) * Tadc

Where:

Padc is the 10-bit pressure output of the MPL115A2 ADC,

Tadc is the 10-bit temperature output of the MPL115A2 ADC,

a0 is the pressure offset coefficient,

b1 is the pressure sensitivity coefficient,

c11 is the pressure linearity (2nd order) coefficient,

c12 is the coefficient for temperature sensitivity coefficient (TCS),

b2 is the 1st order temperature offset coefficient (TCO),

c22 is the 2nd order temperature offset coefficient.

Ideally, Pcomp will produce a value of 0 with an input pressure of 50 kPa and will produce a full-scale value of 1023 with an input

pressure of 115 kPa.

MPL115A2

Sensors

Freescale Semiconductor

Pressure

Coefficient Bit-Width Specs

The table below specifies the initial coefficient bit-width specs for the compensation algorithm.

Total

Coeff.

Bits

10-bit Output: Compensation Coefficient Specs

c12

c11*

c22*

Total Bits

Sign Bits

Integer Bits

Fractional Bits

dec pt zero pad

—

* Factory reserves the option to make these values = 0.

Example Binary Format Definitions:

1. Sign = 0, Integer Bits = 8, Fractional Bits = 4 :

2. Sign = 1, Integer Bits = 4, Fractional Bits = 7 :

Coeff = S I₇I₆I₅I₄I₃I₂I₁I_{0 .}F₃F₂F₁F₀

Coeff = S I₃I₂I₁I_{0 .}F₆F₅F₄F₃F₂F₁F₀

3. Sign = 0, Integer Bits = 0, Fractional Bits = 6, dec pt zero pad = 2 : Coeff = S 0 . 0 0 F₅F₄F₃F₂F₁F₀

4. Sign = 0, Integer Bits = 0, Fractional Bits = 5, dec pt zero pad = 3 : Coeff = S 0 . 0 0 0 F₄F₃F₂F₁F₀

NOTE: Negative coefficients (Sign = 1) are coded in 2’s complement notation.

Coefficient Address Map

Address

Coefficient

$04

$05

$06

$07

$08

$09

$0A

$0B

$0C

$0D

$0E

$0F

a0 MS Byte

a0 LS Byte

b1 MS Byte

b1 LS Byte

b2 MS Byte

b2 LS Byte

c12 MS Byte

c12 LS Byte

c11 MS Byte

c11 LS Byte

c22 MS Byte

c22 LS Byte

For coefficients with less than 16 bits, the lower lsbs are zero. For example, c11 is 11 bits and is stored into 2 bytes as follows:

c11 MS byte = c11[10:3] = [c11_b10, c11_b9, c11_b8, c11_b7, c11_b6, c11_b5, c11_b4, c11_b3

c11 LS byte = c11[2:0] & “00000” = [c11_b2, c11_b1, c11_b0, 0 , 0 , 0 , 0 , 0]

]

MPL115A2

Sensors

Freescale Semiconductor

Pressure

Solder Recommendations

1. Use SAC solder alloy (i.e., Sn-Ag-Cu) with a melting point of about 217°C. It is recommended to use SAC305

(i.e., Sn-3.0 wt.% Ag-0.5 wt.% Cu).

2. Reflow

• Ramp up rate: 2 to 3 C/s.

• Preheat flat (soak): 110 to 130s.

• Reflow peak temperature: 250°C to 260°C (depends on exact SAC alloy composition).

• Time above 217°C: 40 to 90s (depends on board type, thermal mass of the board/quantities in the reflow).

• Ramp down: 5 to 6 C/s.

• Using an inert reflow environment (with O2 level about 5 to 15 ppm).

NOTE: The stress level and signal offset of the device also depends on the board type, board core material, board thickness

and metal finishing of the board.

Handling Recommendations

It is recommended to handle the MPL115A Pressure Sensor with a vacuum pick and place tool. Sharp objects utilized to move

the MPL115A Pressure Sensor increase the possibility of damage via a foreign object/tool into the small exposed port.

The sensor die is sensitive to light exposure. Direct light exposure through the port hole can lead to varied accuracy of pressure

measurement. Avoid such exposure to the port during normal operation.

MPL115A2

Sensors

Freescale Semiconductor

Pressure

PACKAGE DIMENSIONS

CASE 2015-01

ISSUE O

LGA PACKAGE

MPL115A2

Sensors

Freescale Semiconductor

Pressure

PACKAGE DIMENSIONS

CASE 2015-01

ISSUE O

LGA PACKAGE

MPL115A2

Sensors

Freescale Semiconductor

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MPL115A2

Rev. 6

03/2010

MPL115A2_10 [FREESCALE]

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